NEEDS: Broncos' acquisition of QB Joe Flacco from Ravens and trade of QB Case Keenum to Washington becomes official on Wednesday when Denver officially moves on to its sixth quarterback since Peyton Manning retired three years ago. Broncos have big needs along O-line and in secondary, but also at tight end, inside linebacker and defensive tackle, where new coach Vic Fangio wants players who can push pocket to make NFL's top pass-rushing duo of Von Miller and Bradley Chubb even more effective.